Process for the continuous production of aryl carbonates

US5463102A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Norbert Schon · Krefeld, DE
• Johann Rechner · Krefeld, DE
• Paul Wagner · Mülheim an der Ruhr, DE
• Hans-Josef Buysch · Krefeld, DE
• Hans-Erich Gasche · Odenthal, DE
• Ricarda Leiberich · Langen, DE

Key dates

• Filing date: Jan 18, 1994
• Grant date: Oct 31, 1995
• Expiry date: Jan 18, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C68/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Organic carbonates containing at least one aromatic ester group can be obtained in a continuous manner from carbonates containing at least one aliphatic ester group and a phenolic compound in the presence of a transesterification catalyst known per se by carrying out the reaction in at least two stirred containers connected one behind the other in such a way that, in each case, the phenolic compound is metered in liquid form into the first stirred container and the carbonate containing at least one aliphatic ester group is metered in liquid form into one or more of the stirred containers. The carbonate containing at least one aromatic ester group is removed in liquid form from the last stirred container. Volatile reaction products, for example alcohol which has been cleaved out or a dialkyl carbonate are removed in gaseous form from one or more stirred containers.